摘要
将杯[4]醌(Calix[4]quinone,C4Q)通过灌注法与有序介孔炭CMK-3制备成纳米复合材料,可抑制其在常规有机电解液中的溶解。为了进一步提升其电化学性能,本文在C4Q/CMK-3复合材料中加入单壁碳纳米管(SWCNTs),减少了CMK-3的用量,并代替导电炭黑Super-P作为导电剂,通过脱泡搅拌法制备了C4Q/CMK-3/SWCNTs复合材料。研究表明,当m(C4Q)∶m(CMK-3)∶m(SWCNTs)为1∶1∶1时,电化学性能最佳,0. 1 C电流密度下循环100圈后,电池的容量保持为238. 7 m A·h/g,当电流密度增大到1 C时,放电容量仍有260 m A·h/g,这是由于SWCNTs在复合材料C4Q/CMK-3中构建了三维导电网络,增强了电极的稳定性,降低了电池内阻,从而提升了电池的循环性能与倍率性能。
The dissolution of calix[4]quinone(C4 Q) in electrolytes can be inhibited by the C4 Q/CMK-3(mesoporous carbon) nanocomposites prepared through perfusion method,but the electrochemical performance of the nanocomposites needs to be further improved. We prepared a serious of C4 Q/CMK-3/SWCNTs(singlewalled carbon nanotubes) composites with different ratio by deaerating-stirring method. In these composites,SWCNTs substituted conductive carbon blacks Super-P of the original C4 Q/CMK-3 composites,which also reduced the content of CMK-3. SEM and electrochemical tests are conducted to investigate the relation of the morphology and electrochemical performance that cased by SWCNTs. The results show that the optimum mass ratio was m(C4 Q) ∶ m(CMK-3) ∶ m(SWCNTs) =(1 ∶ 1 ∶ 1),which shows a capacity retention of 55% after100 cycles at 0. 1 C. Even at 1 C,the discharge capacity is still 260 m A·h/g. The significant improvement in the electrochemical performance could be ascribed to the formation of three-dimensional conductive network by SWCNTs.
作者
闫冰
熊文旭
郑仕兵
掌学谦
黄苇苇
YAN Bing;XIONG Wenxu;ZHENG Shibing;ZHANG Xueqian;HUANG Weiwei(College of Environmental and Chemical Engineering,Yan Shan University,Qinhuangdao,Hebei 066004,China)
出处
《应用化学》
CAS
CSCD
北大核心
2019年第5期554-563,共10页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(21403187)
河北省自然科学基金(B2015203124)资助~~
关键词
单壁碳纳米管
醌
醌/介孔炭CMK
3
锂离子电池
single-walled carbon nanotubes
calix[4]quinone
C4Q/CMK-3
lithium-ion batteries
